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What is Population Genetics?

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.

Hardy-Weinberg Principle

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Speciation Rates

Speciation Rates

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Related Experiment Video

Updated: Apr 4, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Paramutation in evolution, population genetics and breeding.

Nathan M Springer¹, Karen M McGinnis²

¹Microbial and Plant Genomics Institute, Department of Plant Biology, University of Minnesota, Saint Paul, MN 55108, USA.

Seminars in Cell & Developmental Biology

|September 2, 2015

Summary

This summary is machine-generated.

Paramutation, an epigenetic process causing heritable allele changes, is not well understood in terms of its prevalence or genetic basis. Further research is needed to explore its role in plant evolution and breeding.

Keywords:

Evolution Paramutation Population genetics

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Area of Science:

Genetics
Epigenetics
Plant Biology

Background:

Paramutation involves directed allelic interactions causing heritable changes in allele states.
While characterized at some loci, the genome-wide prevalence of paramutable/paramutagenic alleles remains largely unknown.
Understanding paramutation is crucial for evolutionary studies and crop improvement.

Purpose of the Study:

To investigate the genetic and epigenetic factors underlying paramutation.
To determine the prevalence of paramutation across genomes and populations.
To explore the inheritance patterns of paramutation events in various breeding and natural contexts.

Main Methods:

Analysis of epigenetic regulation and genetic sequences involved in paramutation.
Surveys of allele prevalence and paramutation frequency in populations.
Modeling of inheritance factors such as epigenetic stability, mating systems, and ploidy.

Main Results:

Paramutation involves specific genetic sequences interacting with epigenetic regulatory mechanisms.
Evidence suggests paramutation-like chromatin and expression changes occur at numerous loci.
Inheritance is influenced by epigenetic state stability, mating behavior, and ploidy levels.

Conclusions:

Clarifying paramutation mechanisms and frequency in crops is essential for genetic manipulation and breeding.
Paramutation offers potential for novel strategies in crop improvement.
Studying paramutation enhances our understanding of genome evolution and epigenetic inheritance.